Sewing machine



NOV. 26, 1946. H. BOOTHROYD 2,411,499

SEWING MACHINE Filed June 29, 1945 Inventor Hubev-i- BOOi/m d LSAizfov-neg Patented Nov. 26, 1946 SEWING MACHINE Hubert Boothroyd,Leicester, England, assignor to United Shoe Machinery Corporation,Flemington, N. J., a corporation of New Jersey Application June 29,1945, Serial No. 602,197 In Great Britain July 19, 1944 6 Claims.

This invention is concerned with improvements in or relating to sewingmachines and is particularly, but by no means exclusively, concernedwith curved hooked needle chainstitch welt shoe sewing machinesorganized for sewing an inseam through an upper, a Welt and an insole ofa Goodyear welt shoe; the term shoe used herein being intended toinclude outer footwear generally.

By way of example, the invention is herein illustrated as embodied in awelt and turn shoe sewing machine in which mechanism for supporting awl,needle and other stitch forming devices is arranged to cause the awl andneedle to enter the work from the same side thereof and the chain of theinseam, i. e., the interlocking loops of thread, to lie on the welt.

One of the various objects of the present invention is to enablerelatively movable parts of a shoe inseam sewing machine to be supportedin the machine in such a manner as to prevent undesirable relativemovement.

Another of the various objects of the present invention is to enableparts of a shoe inseam sewing machine which are particularly subject torelatively rapid wear to be readily and inexpensively renewed in aparticularly convenient manner.

In the illustrative machine hereinafter described a needle support, aneedle guide support and a channel guide support all form together acarrier movable towards and from the work about the same axis and in thedirection of work feed so that a needle and a channel guide respectivelysecured on the needle support and channel guide support cooperate withan awl support comprising a second carrier similarly mounted in themachine to eifect a continuous or substantially continuous feed of thework, the needle and channel guide carrier and awl carrier being mountedinreadily removable bearings secured to the machine frame withfastenings common to more than one of the bearings to enable easyreplacement.

In order to provide support for the needlean'd channel guide carrieradditional to that provided by the removable bearings, the needle andchannel guide supports are provided with interengaging portions arrangedoutside the circle of the needle as far as is convenient away from theaxis about which these supports move. These portions, while they allowrelative oscillating movement of the needle and channel guide 'supportsabout said axis, are arranged to prevent undesirable relative lateral ortwisting or cantlng movements of the supports.

- These and other features of the invention consist in certain devices,combinations and arrangements of parts, hereinafter described andclaimed, the advantages of which will be apparent from the followingdescription taken in connection with the accompanying drawing.

In the drawing,

Fig. 1 is a left-hand view in side elevation part of the illustrativemechanism;

Fig. 2 is a sectional View, taken on the line II-II in Fig. 1; and

Fig. 3 is a sectional view, in left-hand side elevation, of theillustrative mechanism taken on the line III-III in Fig. 2.

The machine illustrated in the drawing is a welt shoe inseam sewingmachine of the general character of the machine described in UnitedStates Letters Patent No. 2,041,945, granted May 26, 1936, onapplication of Alfred R. Morrill, except that the machine of the presentapplication is arranged, as in United States Letters Patent No.1,920,998, granted August 8, 1933, also on' application of Alfred R.Morrill, to lay the chain of the seam on the welt instead of in thechannel of the insole of the shoe being operated on, as described insaid first-mentioned patent.

The illustrative machine comprises a curved awl I secured in an awlsupport or carrier 3 arranged to oscillate about an aXis 5 intoengagement with a workpiece and away therefrom. The

awl support 3 has extending from it cylindrical portions 1, l rotatablyand slidably mounted in readily renewable bearings or bushes 9, 9. Thebushes 9, 9 are secured in a bracket H which is fixed to the head of themachine by bolts, one of which is shown at l3. The bracket II has aportion I5 which connects the parts of the bracket ll directlycontacting the machine frame. The bushes 9, 9 each have a flange llextending therefrom, which flanges are secured by fastening screws !9,19 to the frame bracket H. The awl support 3 is moved to and fro in theline of feed by cam-operated levers, portions of which are shown at 2!,2| which engage hardened discs 23, 23 in bores in the cylindricalportions 1, 1 of the awl support 3 and the awl support is oscillatedabout the aXis 5 by cam-operated mechanism similar to that disclosed inPatent No. 1,920,998, re-' ferred to. Y i

The curved hooked needle of the machina indicated at 25, is mounted on aseparate carrier and=is secured in a needle support 21 which hasprojecting from it a sleeve portion 29 (Fig. 2) rotatably and slidablymounted in areadily'replaceable bearing bracket 3! secured by theaforesaid fastening-screws l9, l9 to the frame bracket H. The screws i9,I!) are threaded into the bearing bracket 3! at one side of the framebracket I! and pass through clearance holes in the frame bracket I! andflange H at the other side of the frame bracket it, the undersides ofthe heads of the screws engaging the outer face of the flange. By thisconstruction it is possible to renew the bearing bracket 3| and the bush5 at the left side of the machine merely by removing the set of screwsIE3 at the left which form common fastenings for both the bearingbracket 3! and adjacent bush 9.

The channel guide 33 is secured on a channel guide support 35 which ismounted for oscillation relatively to the needle but forms a part of thecarrier for the needle and channel guide together. The channel guidesupport has projecting from it a sleeve portion 3'! rotatably andslidably mounted in a bracket 39, similar to the bearing bracket 3i,secured to the bracket H by fastening screws in the same manner as thatof the bearing bracket 3!. The bearings for the awl carrier and theneedle and channel guide carrier formedby the pair of bearing brackets3!, 3i) and the adjacent pair of bushes 9 thus may readily be removedfrom the frame bracket i l and renewed if the parts become worn, savingexpense of replacing the larger and heavier parts of the machine;Renewing the bearing brackets when worn, also restores the axialalinement of the needle support and the channel guide support,

To provide additional support for the needle and channel guide carrierparts the channel guide support 35 has secured to it a block M havingformed on it an arcuate guiding or rib portion 43 concentric to the axesof the needle and channel guide support sleeve portions 29, 3? which arethemselves in axial alinement. The arcuate guiding portion i3 engages agroove 45 in the needle support 2?, which-is arranged as far as isconvenient outside the circle of the needle from the axis of the sleeveportion 29. The arcuate guiding portion 53 has on it a face 41*, atright angles to the axes of the sleeve portions 29, 31 and engages aface 49 on the needle support, which engaging faces prevent the needlesupport and channel guide support from separating movement axially awayfrom each other. As shown particularly in Fig. 3, the arcuate guidingportion 43 is of. such angular extent around the aforesaid axesthat,after wear of the bearing in the bracket 39, the arcuate portion alsoprevents twisting or canting movement of the needle support in thebearing about the point of engagement of the needle in the workrelatively to the channel guide during work feed and ensures that theportion 13 and groove 4-5 will be in en agement during the whole of therelative oscillating movement between the needle support and channelguide support about said axes.

The needle'is equipped with the usual form of needle guide 5! secured toa needle guide support 53 positioned between the needle support 2'! andchannel guide support 35. The needle guide support pivotally mounted ona bushing 55 having a tongue-and-groove connection to the needle supportso that it rotates therewith. The block M s ans the thickness of theneedle guide support 53 and thus serves to hold all the parts of theneedle and channel guide carrier together.

Passing through the sleeve portions 29 and 3! of the needle and channelguide carrier and the bushing 55 of the needle guide support is aspindle 51 which has on it a flange 59 engaging the end of the sleeveportion 31. At the end of the spindle 5i opposite the flange the spindleis secured to the sleeve portion 28 by a pin 6!. The pin BI and flange59 on the spindle prevent relative axial movement between the needle,needle guide and channel guide support parts of the carrier but allowthe, supports to oscillate relatively about the axis of the spindle 5?.At each end of the spindle 51 is a small block 63 arranged to be engagedby cam-operated levers, indicated at 65, acting to move the carrier forthe needle, needle guide and channel guide to and fro in the directionof work feed. The needle, needle guide and channel guide are oscillatedrelatively to each other about the axis of the spindle 5'! bycamoperated means, as described more fully in the patents above referredto.

The awl support-3 alone comprises the awl carrier and is separate fromthat formed by the needle and channel guide'supports 2'! and 35 togetherwith the spindle 5] on which the needle, channel guide and needle guideare .mounted. The construction and arrangements of the carriers thus arecompact, rigid and durable in use and serve in minor particulars toassist in assembling the various carrier parts and bearing memberstherefor during the manufacture of the machine. The construction of thearcuate guiding portion 43 and groove 45;, being remote from the spindle51, obviously interferes in no' way with the assembly of the needle andchannel guide supports and is conducive to an extremely ruggedconstruction.

The nature and scope of the invention having been indicated and aparticular embodiment thereof having been described, what is claimedis:

1. A chain stitch inseam shoe sewing machine having a frame member,stitch forming devices in the frame member including a curved hookneedle, an awl, a channel guide, and a carrier on which the needle and asecond one of the stitch forming devices are mounted, and a separatecarrier on which the third one of the stitch forming devices is mounted,in combination readily removable bearing members for said car'- rierssecured in the frame member with a fastening common to more than one ofthe bearing members.

2. A chain stitch inseam shoe sewing machine having a frame member,stitch forming devices in the frame member including a curved hookneedle, an awl, a channel guide, and a carrier on which the needle and asecond one of the stitch forming devices are mounted, and a separatecarrier on which the third one of the stitch forming devices is mounted,in combination with readily removable bearing members for said carrierscomprising a bearing bracket and a flanged bearing bush with a commonfastening screw passing through the flange of the bush, the frame memberand the bearing bracket to secure said parts-together.

3. A chain stitch inseam shoe sewing machine having a frame member,-stitch forming devices in the frame member including a curved hookneedle, an awl, a channel guide; and a carrier on which the needle and asecond. one of the stitch forming devices are mounted, and asep aratecarrier on which the third one of, the'stitch;

forming devices is mounted, in combination'with readily removablebearing members for said car-:- riers comprising a pair ofbearingbrackets and bush, the frame member and a bearing bracket tosecure said parts together.

4. A chain stitch inseam shoe sewing machine having work feeding andstitch forming devices including a curved hook needle, an awl, and achannel guide mounted for relative oscillating movement, a carriermovable back and forth in the direction of Work feed upon which the awlis mounted, a separate carrier movable back and forth in the directionof work feed comprising axially alined supports for the needle andchannel guide, and a spindle for preventing a relative movement fromaxial alinement between the needle and channel guide supports, incombination with interengaging portions on the needle and channel guidesupports outside the circle of the needle for preventing axial movementof the needle support relative to the channel guide during the whole ofthe relative oscillating movement of said supports.

5. A chain stitch inseam shoe sewing machine having work feeding andstitch forming devices including a curved hook needle, a channel guide,and a needle guide located between the needle and channel guide andmounted for relative oscillating movement, and a carrier on which theneedle, channel guide and needle guide are mounted, including axiallyalined supports for the needle and channel guide, and a spindle forpreventing relative movement from axial alinement between the needle andchannel and needle guide supports, in combination with rib and groovemeans on the needle and channel guide supports spanning the needle guideand preventing axial movement of the needle support relative to thechannel guide support during the whole of the relative oscillatingmovement of said supports.

6. A chain stitch inseam shoe sewing machine having work feeding andstitch forming devices including a curved hook needle, an awl, and achannel guide mounted for relative oscillating movement, a carriermovable back and forth in the direction of work feed upon which the awlis mounted, a separate carrier movable back and forth in the directionof work feed comprising axially alined supports for the needle andchannel guide, and a spindle for preventing a relative movement fromaxial alinement between the needle and channel guide supports, incombination with interengaging portions on the needle and channel guidesupports remote from said spindle for preventing relative axial movementof separation between said supports.

HUBERT BOOTHROYD.

